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Simplifying 21 + 6a = -12 + 3a Solving 21 + 6a = -12 + 3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3a' to each side of the equation. 21 + 6a + -3a = -12 + 3a + -3a Combine like terms: 6a + -3a = 3a 21 + 3a = -12 + 3a + -3a Combine like terms: 3a + -3a = 0 21 + 3a = -12 + 0 21 + 3a = -12 Add '-21' to each side of the equation. 21 + -21 + 3a = -12 + -21 Combine like terms: 21 + -21 = 0 0 + 3a = -12 + -21 3a = -12 + -21 Combine like terms: -12 + -21 = -33 3a = -33 Divide each side by '3'. a = -11 Simplifying a = -11
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